Derrick



Dec. 9, 1969 H H-lNbs,

Y Filed oct. 22, 196s JNVENTOR. ,405527 #//VDS BY 7 United States PatentO 3,482,713 DERRICK Hubert Hinds, 1112 N. 3rd St., Springfield, Ill.62702 Filed Oct. 22, 1968, Ser. No. 769,492 Int. Cl. B66c 23/60 U.S. Cl.214-1 5 Claims ABSTRACT F THE DISCLOSURE A portable derrick having meansprovided with the block thereof, which serves to sustain one axiallydisposed marginal portion of a conventional plaster board buildingceiling panel in substantially pivotal relation with the axiallydisposed underside edge of a pre-framed ceiling joist, thereby saidpanel may be swung in an upward direction into contiguous dependingrelation with a plurality of identical spaced joist for nailing thereto.

My invention relates to a portable derrick which serves to facilitatethe installation of a cumbersome plaster board panel to the ceilingjoists of a building, and more particularly to the block thereof.

My invention resides in a portable derrick having means provided withthe block thereof, which serves to sustain one axially disposed marginalportion of a conventional plaster board building ceiling panel insubstantially pivotal relation with the axially disposed under-side edgeof a pre-framed ceiling joist, thereby said panel may be swung in anupward direction into contiguous depending relation with a plurality ofidentical spaced joists for nailing thereto.

The main object of my invention is to provide an implement of theaforementioned characteristics which will serve to enable a singlejourneyman to install a conventional plaster board building panel to theunderside edges of a plurality of 4spaced ceiling joists composed ofwood.

Another object of my invention is to provide a derrick which can besustained in angular relation with both the iioor surface and undersideedge of a preframed ceiling joist.

A further object of my invention is to provide such a device which canbe quickly and easily assembled for its intended use, and easily movedfrom one location to another within either a building or in a suitablevehicle.

A still further object of my invention is to provide such an implementwhich will be relatively light in weight, durable in construction, forthe everlasting use thereof, and which may be relatively economicallyproduced.

Other objects and advantages of my invention will henceforth becomereadily apparent when evaluated from the following detailed description,and accompanying drawing thereof, and wherein:

FIGURE 1 is a view in vertical section of a preferred embodiment of myinvention.

FIGURE 2 is a view in side perspective thereof, and wherein certainsights have been provided in order to yreveal inner elements ofconstruction, and further, the

view includes a substantial illustration of the use thereof.

FIGURE 3 is an enlarged view in real elevation of FIGURE 2.

Now referring to the details within the several cited views, the numeralindicates in general my invention, and wherein it is shown to comprisethe elongated mast 11 of selective length, which is provided with arectangular cross section, and wherein mast 11 is composed of wood,though it may be constructed of other materials, providing the costthereof is not prohibitive.

With reference being had to FIGURE 1 therein is shown that mast 11 isprovided with an axial bore 12 in 3,482,713 Patented Dec. 9, 1969 icethe medial lower body portion thereof, which is adapted to slidablycomplement in telescopic relation therewith a substantial body portionof the jack-screw 13, which is shown to be disposed in threaded relationwith the end wall 14 of the cup shaped rectangular casing 15, which isadapted to slidably complement a transverse end body portion of thecited lower body portion of mast 11, for fixed contiguous dependingrelation therewith, as when anchored thereto by the plurality of opposedscrew fasteners 16.

Further, jack lscrew 13 is integrally provided with the ball member 17of the pivotal union 18 wherein the socket member 19 thereof is formedin the apex of the inverted cone shaped wall of base plate 20, andserving to facilitate the inward or outward threading of the jackscrew13 in respect to the mast axial bore 12, there is provided in slidabletransverse relation with the lower body portion of jack-screw 13, thehandle-bar 21.

Now with additional reference to FIGURE 3 wherein it is shown that theblock 22 surmounts both laterally and extensibly the upper-most bodyportion of mast 11, and wherein derrick block 22 is shown to comprise asubstantially open ended housing as provided by the pair ofsubstantially rectangular comated wall plates 23, 24, which bridge theopposite side faces 25, 26, of mast 11 respectively, in fixed relationtherewith, as by virtue of the pair of spaced bolt fasteners 27, 27,which are transversely aiiixed therewith. Further, wall plates 23, 24,`are provided with inturned lateral flanges 28, 28, which are disposedin contiguous relation with the transverse side face of mast 11, and inspaced relation relative to each other, thereby providing an `axiallydisposed opening therethrough which superposes mast 11, through whichprojects a sector portion of a at rimmed sheave 29, which is journaledupon the shaft afforded by the bolt fastener 30, which is aiiixed intransverse relation with housing wall plates 23, 24, and wherein sheave29 is spaced from the end wall face of mast 11.

Sheave 29 serves to track an open ended flexible strap 31 trainedmedially thereon, and wherein an inner body portion 32 thereof isdisposed in overlapping contiguous relation with the backstay 33 whichcomprises an elongated rectangular plate member 34 adapted to interposein transverse relation housing wall plates 23, 24, and in inclinedrelation with mast 11, as when the pair of opposed transversing sleevemembers 35, 35, which depend integrally from backstay 33 are slidablysecured upon the pair of shafts afforded by the pair of spaced boltfasteners 3-6, 36, which are affixed in transverse relation with housingwallplates 23, 24. Thereby strap 31 may be constrained from movingthrough derrick block 22 in an outward direction, by the pawl 3-7 whichis provided with a sector shaped eccentrically disposed periphery orbrakeshoe 3-8 with one free end portion thereof, wherein the oppositeend portion thereof is journaled on the shaft afforded by the boltfastener 38a which is disposed in affixed transverse relation withhousing side-wall plates 23, 24, in a manner whereby the lesser radialextent of brake-shoe 38 will be disposed in contiguous complementaryrelation with the cited body portion of strap 31 which has been said tooverlap backstay 3-3 as when pawl 37 is manually swung in a counterclockwise direction, thereby the brake-shoe 38 thereof willprogressively increase the intensity of a clutching pressure thereon,for the reason that its periphery increases simultaneously in length,and which recited positioning of brake shoe 38 in respect to strap 31 isautomatically retained by virtue of the pull spring 39, which interposesin fixed relation both the annular grooved body portion 4()` of thestubshaft 41 which is iixedly secured in inwardly disposed lateralrelation with block housing side-wall 23, and with the perforated bodyportion 42 of the depending triangular shaped member 43 which isintegrally provided with the journaled body portion of pawl 37. It nowbeing axiomatic that the brake means as recited will permit strap 31 tomove in a downward direction in respect to backstay 33, as when amanually applied pulling action is applied upon the free end portionthereof, for the reason that brake-shoe 38 will be inuenced by africtional action transposed thereon by strap 31 to move accordingly,and to simultaneously release its recited pressure thereon, and for thepurpose of providing a means whereby use of the braking means may beselective in use of the invention, then for this reason there isprovided a pull cord 44 which hangs freely in secured relation with theeye body portion 45 of eye-bolt fastener 46 which is aixed in dependingtransverse relation with pawl 37 adjacent brake-shoe 38` Pull-cord 44 isprovided with a substantial knot 47 adjacent the eye body portion 45 ofeye-bolt 46, and which knot 47 normally superposes in spaced relationthe eye 48 of a keyhole opening provided through a rectangular plate 49which is adapted to interpose in transverse relation a lower bodyportion of the block housing side wall plates 23, 24, and wherein plate49 is secured with the latter in a manner previously described forbackstay 33, whereby it is now apparent that when pullcord 44 isextended through key-hole eye 48 that knot 47 will follow accordinglyand pass therethrough, and when pull cord 44 is slidably passed into thecommunieating key-hole slot 49a and released therein that pullspring 39will act to draw knot 47 against the underside face of plate 49, therebypawl 37 will be simultaneously inuenced to move in a clockwisedirection, and wherein brake shoe `38 will be spaced from strap 31, ofwhich the outer` free end body portion 50 thereof is disposed in loopedfixed relation as at 51 with the bail body portion 52 of a dependingrectangular shaped hook 53, which normally is disposed in nestledrelation with a pair of complementary hooks 54, 54, which extend inlateral integral relation with a pair of elongated rectangular plates55, 55, respectively of identical shape; Plates 55, 55, are adapted toextend laterally from the opposite side faces 25, 26, of mast 11respectively, as when clamped thereagainst by the pair of diagonallyspaced bolt fasteners 56, 56, which are affixed transversely with plates55, 55, and in tangible slidable relation with the opposite transverselydisposed pair of faces of mast 11, thereby hooks 54, 54, may besimultaneously disposed in adjusted relation with mast 11, and normally,hooks 54, 54, are disposed upon the lower-most body portion of mast 11,the purpose of which will Ibe henceforth described.

Now with reference being had to each respective View in the drawing,there is shown that block 22 carries in transverse recessed weldinglyfixed relation therewith the angle iron bar v56 of which the medial bodyportion thereof is spaced in superposed relation with sheave 29, in amanner wherein the bar leg 57 is disposed at right angles to the topfree edges of housing plates 23, 24, and the associated bar leg 58 isdisposed at right angles with the plate anges 28, 28. Further, bar 56includes a plurality of spaced bayonets 59, 59, 59- of circular crosssection which are disposed in upstanding weldingly fixed relation withthe inwardly disposed face 60 of bar leg 57, and which serve ahenceforth described purpose.

Now with particular reference to FIGURE 2 wherein the use of myinvention is illustrated there is shown that mast 11 is disposed inextended interposed fixed relation with the ioor surface 61 and theceiling joist 62 of a building (not shown) in a manner whereby thevertically disposed leg 57 of angle iron bar 56 is disposed in axialrelation with an outwardly disposed body portion 63 of the undersideaxially disposed edge of joist `62, and in contiguous angular relationtherewith, as when bayonets 59, 59, 59, have previously been directed byvirtue of jackscrew 13 to pierce the recited edge in a complementar-yangle thereto, and by virtue of the recited pivotal union 1-8, thenderrick 10 will be enabled to sustain itself in a slightly inclinedposition. Thereby mast 11 will be enabled to track the movement of theplaster board panel 64 in the direction of the indicating pair of arrows65, 65, as when the lower axial edge 66, of panel 64 is balanced uponthe stirrup ibar 67, afforded by the hook 53, which has been recited asbeing stabilized by the pair of overlapping lrooks 54, 54 and whereinthe opposite axial edge 68 of the panel will be disposed against a bodyportion of flexible strap 31 which itself will be inliuenced to glideupon mast 11 lby the inclined position of the panel in respect thereto,as when a manually applied pulling action is applied upon the free endof the strap 31, and by Virtue of the purchase afforded by block 22,then the axial panel edge 68 may be sustained in pivotal dependingrelation with the inwardly disposed axial edge 69 of joist 62, whereinpanel 64 will lend itself for a swinging action in the direction of theindicating pair of arrows 70, 70, as applied thereon by the journeyman,as when both grasping the panel edge 66, and simultaneously ascending astep ladder, and when panel edge 66, is disposed in contiguous dependingrelation with the underside edge 71 of a pre-positioned joist 72, thenit being axiomatic that the opposite panel edge 68 will be disposed incomplementary axial relation with the opening afforded by the angle ironbar 56 wherein the edge may be recessed therein, wherein the strap 31will now have a slack body portion provided in depending relation withpanel 64, which will enable the journeyman to remove the hook 53therefrom, and to secure the panel edge 66 to joist 72, as by nailing,and with a similar operation provided with the opposite axial edge 68 ofpanel 64, then conventionally it will sustain itself in a finishedposition, and wherein derrick 10 may then be collapsed and relocated forthe re-use thereof.

I claim:

1. In a derrick for use in the installation of a plaster board ceilingpanel, comprising a base adapted to rest upon the surface of a floor, ajack-screw united in pivotal upstanding relation with the central bodyportion of said base, a casing having a rectangular shaped body, adaptedfor threadable relation with said jack-screw, a mast comprising anelongated member adapted for a xed telescopic connection with saidcasing, said mast provided with an axial bore within the fixed endportion thereof to accommodate the extent of said jack-screw therein, ahandle slidably fixed in transverse relation with a lower body portionof said jack-screw to facilitate the alternate threading of saidjack-screw as when extending or retracting said mast in respect to saidbase, a bracketed hook disposed in slidable adjustable relation with alower body portion of said mast, and wherein said hook extends laterallyfrom one side face thereof; a derrick block provided with the oppositefree end of said mast, comprising a pair of substantially rectangularco-mated plates fixedly secured with the transverse side faces of saidmast respectively, said plates adapted to extend laterally from theopposite side face of said mast, and extensibly the end wall thereof,said plates including a pair of spaced inturned fianges disposed incontiguous relation with the first said side face of said mast, a atrimmed pulley disposed rotatably in interposed relation with saidplates, and superposed relation with said mast end wall, said pulleyadapted to project a sector body portion thereof through the openingafforded by said tianges, whereby the alternate side-wise movement ofsaid pulley in respect to its shaft is obviated, a flexible elongatedopen ended strap having a medially disposed body portion thereof trainedabout a radially disposed sector body portion of said pulley, whereinthe free end body portions thereof will be disposed in complementaryrelation with the said pair of side faces of said mast respectively, asecond hook formed of an elongated strap element having a bail memberdisposed in fixed relation with the outwardly disposed terminal bodyportion of said strap, and a iiat web member constituting herein astirrup, said hook adapted to normally rest in interfitting slidablerelation with said rst mast hook for stabilizing the latter in respectto said mast means for detachably securing said derrick block intransverse relation with an inwardly disposed marginal portion of theunderside edge of a pre-framed ceiling joist composed of wood, wherebysaid derrick may be supported in interposed slightly inclined fixedrelation with both said oor and said ceiling joist, and thereby saidmast will accommodate an elongated rectangular shaped plaster boardbuilding panel thereagainst, through an interposed body portion of saidstrap, as when the lower longitudinally disposed edge of said panel ispositioned in a balanced state within said hook, for support upon saidstirrup, thereby said panel may be elevated in slidable relation withsaid mast into pivotal fixed relation with the outwardly disposed axialportion of said underside edge of said joist, by virtue of said blockand tackle, means to fixedly sustain said depending position of saidpanel in respect to said joist, and means provided with the first saidmeans for supporting a medially disposed marginal portion of saidpivoted panel edge against the underside edge of said joist, as whensaid panel is swung in a counterclockwise direction from said masttowards a second ceiling joist spaced in parallelism with the first saidjoist by virtue of the fixed extent of said strap in respect to saidblock.

2. As claimed in claim 1, wherein the detachable securing means forsupporting said inclined positioning of said derrick in respect to saidfloor surface and said joist com prises a plurality of spaced bayonetswhich are disposed in weldingly fixed transverse extensible relationwith the outer face of one flange of an elongated angle iron bar whichis affixed in transverse medial recessed relation with the said housingsidewalls corner edges which superpose said pulley, in a manner wherebythe axis of said vertically disposed angle iron flange has its free edgedisposed in flush relation with the top free edges of said housingsidewalls, and wherein the associated angle iron flange has its freeedge aligned in flush relation with the depending pair of housingsidewall iianges, thereby said bayonets will be aligned in axialrelation with said mast, and when directed in slightly inclined relationwith the under-side edge of said ceiling joist while simultaneouslypositioning said mast they may then be forced to pierce said joist, byVirtue of said screw-jack when simultaneously extending said mast andsaid block into the previously described selective positioning thereofin respect to both said oor surface and said underside edge of saidjoist.

3. As claimed in claim 1, wherein the means for sustaining the upperaxially disposed free edge of said plaster board panel in fixed pivotalrelation with the underside edge of said joist, as when elevatedthereagainst by virtue of said block and tackle comprises a pawl memberhaving an integral eccentrically disposed sector shaped end portionconstituting herein a brake-shoe which is adapted to latch upon infrictional transverse relation a body portion of said strap as whendisposed in overlapping contiguous relation with a back-up plateconstituting herein a stay, which is disposed in interposed fixedtransverse relation with said housing side-walls, and wherein said pawlmember is adapted for pivotal relation with a bolt fastener which isdisposed in affixed transverse relation with said housing side walls andin spaced relation with said stay, and further, wherein said pawl isresiliently biased to move in a counter clockwise direction by virtue ofa pull spring, thereby said brake-shoe will be simultaneously influencedto progressively move the increasing radially disposed extent thereofinto locking relation with said interposed body portion of said strap,as when the outwardly disposed body portion thereof in respect to saidblock is tensioned in a down-ward direction by the weight of saidplaster board panel when carried by said stirrup in an elevated positionin respect to said mast hook, brake releasing means connected with saidpawl member for selectively spacing said brake shoe from said strap, aswhen said stirrup is to be stabilized by said mast hook by a downwardlydirected pulling action manually applied upon the said outwardlydisposed body portion of said strap for moving said stirrup in thedirection of said mast hook.

4. As claimed in claim 3 wherein the brake releasing means comprises apull cord depending in fixed relation with said pawl member adjacentsaid brake-shoe, and wherein said pull cord is provided with an enlargedknot which normally superposes the eye of a keyhole provided in arectangular shaped plate, which is disposed in interposed transverselyfixed relation with said housing side walls, thereby said knot may bepassed through said eye by a manually applied pulling action appliedupon the free end portion of said pull cord, and when said knot isdisposed in bearing relation with the underside face of said keyholeslot as when passed thereunder by virtue of said pull cord, saidbrake-shoe will be simultaneously inuenced to move in a clockwisedirection and from said strap.

5. As claimed in claim 1, wherein the means provided with the first saidmeans for supporting a medially disposed marginal portion of saidpivoted panel edge as when swung radially in a counter clockwisedirection and towards a seco-nd joist spaced in parallelism with thefirst said joist, as from the initial positioning thereof to a secondsubstantially horizontal position, by virtue of the hold thereon by saidstrap hook, comprises the ledge provided by the substantiallyhorizontally disposed flange of said angle iron bar, and which saidflange is spaced from the underside edge of said first joist, therebysaid pivoted panel edge may be simultaneously disposed within saidrecess as when moved from said underside edge of said joist during thepreviously described swinging action applied upon said panel therebyproviding a slack body portion within said strap for accommodating therelease of said strap hook from said panel edge for nailing said freelydisposed panel edge to the underside edge of said second ceiling joist.

References Cited UNITED STATES PATENTS 2,443,349 6/ 1948 Foster.2,604,303 7/1952 Grady 254-143 2,883,073 4/ 1959 Morris.

GERALD M. FORLENZA, Primary Examiner FRANK E. WERNER, Assistant ExaminerU.S. Cl. X.R.

